1. Ludwig-Maximilians-University Munich,Chair in Hybrid Nanosystems, Faculty of Physics,Munich,Germany,80539
2. Universidade Federal de Pernambuco,Physics Department,Recife-PE,Brazil,50670-91
3. Universidade de São Paulo,Chemistry Department,Preto-SP,Brazil
4. School of Physics and Astronomy, Monash University,Melbourne,Victoria,Australia